I have just got 2 server power supply's, Astec IBM AA23260, and I've solder the pins together so that I got 12V out, but do anyone know how to wire the supply's to get 24V, is there just to remove the ground from the outer case? and wire them in series?
Do anyone know this?

I followed the directions in the attached link to wire two similar power supplies together. Note that these power supplies are from a different manufacture so some things may be different, but if you have a general knowledge of power supplies, you should be able to figure it out.